“do now” for tuesday, february 4 th
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“DO NOW” FOR TUESDAY, FEBRUARY 4 TH. WHAT TYPE OF FORCES ARE NECESSARY IN ORDER FOR AN OBJECT TO MOVE? THERE ARE TWO POSSIBLE ANSWERS. “Do Now” for Thursday!. Draw a balanced and an unbalanced force. Illustrate the net force in each drawing. Forces = Pushes & Pulls!. - PowerPoint PPT PresentationTRANSCRIPT
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“DO NOW” FOR TUESDAY, FEBRUARY 4TH
WHAT TYPE OF FORCES ARE NECESSARY IN ORDER FOR AN OBJECT TO MOVE? THERE ARE TWO POSSIBLE ANSWERS.
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“Do Now” for Thursday!
Draw a balanced and an unbalanced force.Illustrate the net force in each drawing.
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Forces = Pushes & Pulls!
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We know that the strength of a force is measured in SI units called Newtons…After Sir Isaac Newton. 1
Newton is equal to about 102 grams (0.22481 pounds).
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Sir Isaac Newton
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Net Force is the sum or difference of the forces on an object.
Net force = 300NGreen Team Wins!
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What is a NON-ZERO FORCE?Same as an unbalanced force!
Non-zero = Unbalanced = Movement!
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What is a ZERO FORCE?Same as a balanced force!Zero force = Balanced = NO Movement
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Balanced?
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Balanced?
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Balanced?
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So what is WORK??
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Work is done when an object is moved in the direction in which a force is applied to
it.
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Is There Work Without Motion?
NOPE!No Work Here!
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Carrying your backpack to school might seem like work - but it’s not!
^^^FORCE
DIRECTION
The force must be in the direction the object moves!!!
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Pushing, dragging or pulling your backpack = work!
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FORMULA FOR WORK!
Work = Force X Distance(Newtons)
(Meters)
Work is calculated as the amount of force applied to an object times the distance the object moves. The term JOULE is used to describe a unit of work.
(Joule)
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FYI – A 500N runner in the Empire State Building’s “Run-Up-Race” creates 160,000 joules of work while climbing the 1,576 steps. Enough
work to lift an elephant over 3 meters!
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What is Power?
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FORMULA FOR POWER!Power = Work OR Power = Force X Distance Time Time
Power is described in Joules/Second units called WATTS.
One joule of work done in one second = one watt of power.
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A watt is a very small unit!Power is often measured in larger units such as Kilowatts (Kw) or Horsepower (hp).
1 Kilowatt = 1,000 watts1 Horsepower = 746 wattsThe average car has 110 – 150 hp.The average semi-truck has 200-400 hpA drag race car can have over 5,000 hpThe average horse has 22.5 hp.
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Try some Equations!